diff --git a/src/add-ons/accelerants/neomagic/engine/nm_bes.c b/src/add-ons/accelerants/neomagic/engine/nm_bes.c
index 0f2f7080d2..2141a9d60d 100644
--- a/src/add-ons/accelerants/neomagic/engine/nm_bes.c
+++ b/src/add-ons/accelerants/neomagic/engine/nm_bes.c
@@ -242,8 +242,8 @@ static void nm_bes_calc_move_overlay(move_overlay_info *moi)
 	 *******************************/
 
 	/* calculate inputbitmap origin adress */
-	moi->a1orgv = (uint32)((vuint32 *)si->overlay.ob.buffer);
-	moi->a1orgv -= (uint32)((vuint32 *)si->framebuffer);
+	moi->a1orgv = (uintptr_t)((vuint32 *)si->overlay.ob.buffer);
+	moi->a1orgv -= (uintptr_t)((vuint32 *)si->framebuffer);
 	LOG(4,("Overlay: topleft corner of input bitmap (cardRAM offset) $%08x\n", moi->a1orgv));
 
 	/* Setup vertical source start: first (sub)pixel contributing to output picture. */
diff --git a/src/add-ons/accelerants/neomagic/engine/nm_crtc.c b/src/add-ons/accelerants/neomagic/engine/nm_crtc.c
index 42d65b33b7..b8437676d8 100644
--- a/src/add-ons/accelerants/neomagic/engine/nm_crtc.c
+++ b/src/add-ons/accelerants/neomagic/engine/nm_crtc.c
@@ -955,7 +955,7 @@ status_t nm_crtc_cursor_init()
 	nm_crtc_depth(BPP8);
 
 	/* clear cursor: so we need full RAM access! */
-	fb = ((vuint32 *)(((uint32)si->framebuffer) + curadd));
+	fb = ((vuint32 *)(((uintptr_t)si->framebuffer) + curadd));
 	for (i = 0; i < (1024/4); i++)
 	{
 		fb[i] = 0;